title: [Boris Sergeevich Preobrazhenskii; 60th anniversary of birth].
mesh_terms: D000846:Anniversaries and Special Events; D049672:History, 19th Century; D049673:History, 20th Century
keywords: BIOGRAPHY
vernacular_title: Boris Sergeevich Preobrazhenskii; k 60-letiiu so dnia rozhdeniia.